How Is a Credit Score Calculated? The 5 Key Factors Explained
A credit score is a number, typically ranging from 300 to 850, that summarizes how well you've managed credit in the past, based on information in your credit report.
Official Source: Consumer Financial Protection Bureau (CFPB) — "What Is a Credit Score?" — https://www.consumerfinance.gov/ask-cfpb/what-is-a-credit-score-en-315/
According to the CFPB, you don't have just one credit score — each score depends on the specific data used, the scoring model applied, and even the day it was calculated. The most widely used scoring model is the FICO Score, which weighs five main categories differently. Understanding this breakdown, and the formula behind it, can help you see exactly where to focus your efforts if you're trying to improve your score.
Table of Contents
- Definition
- The Credit Score Weighting Formula
- Factor 1: Payment History (35%)
- Factor 2: Amounts Owed (30%)
- Factor 3: Length of Credit History (15%)
- Factor 4: New Credit (10%)
- Factor 5: Credit Mix (10%)
- Why Your Score May Differ Across Models
- Step-by-Step: Improving Each Factor
- A Real-World Example
- Common Mistakes
- Expert Tips
- Related Calculators
- Frequently Asked Questions
- References
- Conclusion
Definition
A credit score is a numerical summary of a person's credit risk, generated by a scoring model using information from a credit report, and used by lenders to help decide whether to extend credit and on what terms.
The Credit Score Weighting Formula
While the exact calculations behind credit scores are proprietary, FICO — the scoring model used by the large majority of top lenders — publishes the general weighting of its five main categories:
FICO Score = 35% Payment History + 30% Amounts Owed + 15% Length of Credit History + 10% New Credit + 10% Credit Mix
These weightings represent an average across consumers; FICO notes the importance of each category can vary somewhat depending on an individual's specific credit profile, such as someone with a short credit history.
Factor 1: Payment History (35%)
Payment history is the single largest factor in most FICO scoring models. It reflects whether you've paid past credit obligations on time. A payment reported 30 days or more late can meaningfully lower your score, and the damage tends to grow the further behind a payment falls.
Factor 2: Amounts Owed (30%)
This factor looks at how much you currently owe across all accounts, including your credit utilization ratio — the percentage of your available revolving credit currently in use. Many credit scoring resources suggest keeping utilization below 30% of your total available credit, with even lower utilization generally associated with stronger scores.
Factor 3: Length of Credit History (15%)
This factor considers the age of your oldest account, your newest account, and the average age of all your accounts. A longer credit history generally gives lenders more data to assess, which is why closing old accounts — even unused ones — can sometimes lower your score by reducing your average account age.
Factor 4: New Credit (10%)
Opening several new credit accounts in a short period can signal higher risk, particularly for consumers with a shorter credit history. This category also reflects hard inquiries, which occur when a lender checks your credit report as part of a new application. Checking your own credit report generally results in a soft inquiry, which does not affect your score.
Factor 5: Credit Mix (10%)
Credit mix considers whether you have experience managing different types of credit, such as revolving accounts (credit cards) and installment accounts (auto loans, mortgages, personal loans). This is generally one of the smaller factors, and opening a new account solely to diversify your credit mix is not typically recommended by financial educators as a primary strategy.
Why Your Score May Differ Across Models
According to the CFPB, credit scores can differ depending on the scoring model used, the specific bureau's data, and the date the score was calculated. FICO and VantageScore are the two most common scoring companies, and while both consider similar underlying factors, they don't necessarily weight them identically. This is why you may see a different number depending on where you check your score.
| Scoring Factor | FICO Weighting |
|---|---|
| Payment History | 35% |
| Amounts Owed | 30% |
| Length of Credit History | 15% |
| New Credit | 10% |
| Credit Mix | 10% |
Step-by-Step: Improving Each Factor
- Set up autopay or reminders to ensure on-time payments, since payment history carries the most weight.
- Pay down revolving balances to lower your credit utilization ratio.
- Avoid closing old, unused credit accounts if you're trying to protect your average account age.
- Apply for new credit only when needed, rather than opening multiple accounts in a short window.
- Maintain a reasonable mix of account types over time, without opening unnecessary new accounts purely for this purpose.
- Check your credit report annually through AnnualCreditReport.com and correct any errors you find.
A Real-World Example
Consider two borrowers with the same total debt. Borrower A has a long credit history, uses 15% of their available credit, and has never missed a payment. Borrower B has a shorter credit history, uses 60% of their available credit, and had one payment 45 days late two years ago. Even with similar overall debt levels, Borrower A is likely to have a meaningfully higher score, since payment history and amounts owed together make up 65% of the FICO weighting, and Borrower B is weaker on both fronts.
Common Mistakes
- Assuming there's only one universal credit score, when in fact different models and bureaus can produce different numbers.
- Closing old credit cards, which can reduce your average account age and available credit simultaneously.
- Maxing out credit cards even while making on-time payments, which still increases your amounts-owed factor.
- Opening several new accounts at once before applying for a major loan like a mortgage.
- Ignoring credit report errors that could be dragging down your score unnecessarily.
Expert Tips
- Focus first on payment history and amounts owed, since together they make up 65% of the FICO weighting.
- Check your credit utilization ratio monthly and aim to keep it well below 30%.
- Avoid applying for new credit in the months leading up to a mortgage or major loan application.
- Review your full credit report at least once a year for inaccurate late payments or unfamiliar accounts.
Related Calculators
Related Articles
- What Is Loan-to-Value (LTV) Ratio and Why It Matters
- FHA vs. Conventional Loans: Which One Is Right for You?
Frequently Asked Questions
Is my credit score the same everywhere I check it?
Not necessarily. Scores can vary depending on the scoring model, the credit bureau's data, and the date calculated. It's normal to see slightly different numbers across different services.
Which factor should I focus on first to improve my score?
Payment history and amounts owed together make up 65% of the FICO weighting, so consistently paying on time and lowering your credit utilization typically produce the biggest improvements.
Does checking my own credit score lower it?
No. Checking your own credit results in a soft inquiry, which does not affect your credit score. Only hard inquiries from lenders reviewing a new credit application can have a small impact.
Can closing a credit card hurt my score?
Yes, potentially. Closing an account can reduce your average account age and lower your total available credit, both of which can negatively affect your score, even if the account was unused.
References
- Consumer Financial Protection Bureau – What Is a Credit Score?
- Consumer Financial Protection Bureau – Understand Your Credit Score
- Consumer Financial Protection Bureau – Where Can I Get My Credit Score?
Conclusion
Your credit score is built from five weighted factors, with payment history and amounts owed carrying the most influence. Understanding this formula can help you prioritize the actions that matter most, rather than spreading effort evenly across all five categories. This article is educational only and not financial advice; scoring models and weightings can vary by provider, so check your specific credit report and score details through official free resources.